Xapian devel - Apr 2012 - Patch: New features for Learning to Rank

Hello,
Please find attached the patch which contains new features for the LETOR
framework which increases the total features from 19 to 37. In my proposal
I had mentioned of having a final count of 44 IR specific features apart
from those learnt by unsupervised feature learning part via Deep Learning.
So I am left with 7 out of those 44,of which 6 I will be implementing
within the next 2 days(before 22nd).
This patch also contains a 1 line change to
xapian-core/examples/questletor.cc correcting the usage of the questletor
file. I will send in another patch as soon as I am done with those 6
features.

Best regards,
Rishabh.
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